Automatic telephone system



Juny @17, w23. www@ Ni. L.. NELSON AUTOMATIC TELEPHONE SYSTEM Original Filed June 50 1919 2 Sheets-Sheet l fn UEE/Ur Jian/ffl L- ML2/55712 Jully l?, H923 M. Al.. NELSON AUTOMATIQTELEPHONE SYSTEM 2 Sheets-Sheet 2 mil Original Filed June 30. 1.919

/ZZUEZZZUF' [ZEP/fn L- XVe/50m Asa Patentd'Jly 17, 19.23. i M

UNirED STATES 1:"llIN L. NELSON, OF CHICAGO, ILLINOIS, ASSIGNOB T0 AUTOMATIC ELECTRIC COM- .PATENT oFFlcE.

"`PANY, 0F CHICAGO, ILLINOIS, A CORPORATION IO11' ILLINOIS.

.AUTOMATIC TELEPHONE SYSTEM.

Application nled June 30, 1919, Serial No. 853,561. Renewed November 2, 1922. Serial No. 598,647.

To'all whom it my concern: Q

Be it known that I, MARTIN L. NELSON, a citizen of the United States of America, and a resident ofvChicago, in the county of Cook and State f Illinois, have invented certain new and useful Improvements in Automatic TelephoneSystemaof which the following is a specification.

My invention relates in general to an improvement in automatic telephone s stems er of parties per line is often far above the average of the city party line.

In order to give such service a connector must be provided for calling to straight lines in case there are such lines, also to trunk lines leading to another exchange, and must also call to 8 or 12 party lines. Means must also be provided for enabling a subscriber 'on an 8 orf12 party line to call any other subscriber on the same line; I

In the drawings I have shown in Fig. 1 a

. connector switch H which is assumedto be accessible through line switches and selector switches (not shown) of the standard two wire Strowger type to all the lines in the exchange and which has access through its wipers to trunk lines leading to another or a main exchange. Associated with the connector H is a code selecting switch 4Band a code switch C.

In Fig. 2 I have shown a ring back switch D which is accessible to the same selector switches as the connector H and which s used Whenever a subscriber desires to signal another part on his own line. rlhe ring back switch is in the nature of a code selector and'has access to a code,switch C similar to that shown at C (Fig. l).

Common to the connector switches H and the ring back switchesD is a code interrupting device I whose function will be explained.

circuit is completed fory the line relay 2 of connector H in series with 'the calling tele- )hone linetor repeater as the case may be.

elay 2 ener izesand closes a circult at springs 3 an d for slow release relay 5, which in turn energizes to supply ground to the release trunk through springs 6 and to prepare a circuit for the vertical ma net ,7 and slow relay 8 throu h springs 9 an 10.

As soon as the calling evice is operated to send a digit, relay 2 operates in accordance therewith to close the circuit of vertical magnet 7 'and relay 8 a corresponding number of tmesl Ma et 7 operates to step the wipers 11, 12 an 13 to a desired level of the bank in which the called line is located. Relay 8 remains energized to hold a new circuit closed for itself and magnet 7 after the switch steps 0H normal, said circuit extendlng from ground through springs 3 and et. springs 9- and 10, springs le2- and l5, springs 16 and 17 and relay 8 and magnet 7 to battery. As soon as the impulses for this digit cease, relay 8 falls back to close or prepare a circuit through springs 16 and 18 for slow relay 19 androtary magnet 20 in multiple, so that as relay 2 responds to thc next digit, relay 19 energizes and remains energized, While magnet 20 operates to stel the wipers 11, 12 and 13 to the contacts or'- i i the called line.

Relay 19 remains energized for a short interval after the called line is found so that, it the called line is busy and ground is present on its test contact, then busy relay 21 `will energize to lockthe switch on busy and give the calling subscriber a busy signal.

If the called line is idle, however, then when relay, 19 falls back, a circuit is completed from ground through springs 6 of relay 5, springs 22 and 23, lower Winding of relay 24, springs 25 and 26, wip-er 12, and through the bridge cut oil' relay or' the called line switch to battery. Relay 24 energizes and locks itself to ground through springs 27, opens the circuit of relay 21 at springs 28, opens the circuit of magnet 20 at springs 29 and 30, prepares a circuit for certain relays of code selector B at springs 29 and 31, puts ground on the private wiper 12 direct through springs 33, grounds lead 34 to switch B at said springs 33 and cutsthe line circuit through to wipers 11 and 13. Now the calling subscriber will operate his ca lling device in accordance with the last digits of the called number which is for the application of the proper code to the called line. As relay 2 operates in accordance With the first lof these digits, a circuit is intermittently closed from ground through springs 3 and 4, springs 9 and 10, springs 14 and 15, springs 16 and 18, springs 37, springs 29 and 31, conductor 45, springs 38 and 39, relay 35, and vertical magnet 36 to battery. This switch B is of the two motion type of switch in which the wipers are first raised to some level and then rotated to a desired set of contacts upon which a desired code may be found. The magnet 36 pcratcs to step the wipers 40-and 41 to the level of the bank in which the desired code located. Relay 35 energizes on the first impulse and remains energized, due to -its .sh/w action, until after the last vertical impuise comes in. This relay 35 holds a new .ircuit closed for itself and for magnet 36 extending from conductor 45, through springs38 and 42, springs 43 and 44, and through relay 35 and magnet 36 to battery as soon as the switch takes its rst step to apen springs 38 and 39 and close the springs 38 and 42. After the last vertical impulse comes in relay 35 falls back to prepare a new impulsing circuit from the line relay 2 of the rcnnector H, said circuit extending from the conductor 45, springs 38 and 42, springs 43 and 46, springs 47, relay 48, and rotary magnet 49 to battery. During the impulses corresponding to the last code digit relay 48 stays in energized position to hold a short circuit about the springs 47 at springs 50, closes a circuit for relay 51 at springs 52, and opens one point in the circuit of the rotary magnet 54, of' the code interrupter switch at springs 53. Relay 51 energizes and locks energized from ground through springs 32 of relay 24 of the connector through springs 55 and. 56 and springs 57 to relay 51 and battery. Relay 51 also opens the springs 47, closes the springs 58 in the circuit of magnet 54, supplies an additional ground to conductor 34 of connector H, and closes a circuit from ground through springs 59, over conductor 60, to the interrupter mechanism I. The interrupter I is simplyx a series of relays which interrupt each others circuits to cause an intermittent ground to be applied to a series of conductors such asV 61 and 62 one of which conductors may lead to a single switch or to a group of'fswitches, Any standard type of machine interrupter may be used in place of the'relays I. As

soon as relay 48 falls back after the rotary impulses have ceased the wipers 40 and 41 stand in connection with the third, 6th, 15th and 18th contacts in the bank of contacts accessible to a wiper 63, which isv rotated over its contacts by a magnet 54. Magnet 54 starts its operation as soon as the sprin 53 of relay 48 close when `that relay fa s back, the circuit extending from ground through springs of interrupter Iconductor 61, springs 53, springs 58, and magnet 54 to battery. The wipers 63 and 64 move together on a common shaft. Assume the code number called to be 22, that is, the wipers of the switch B have been raised to the second level and rotated to the second contact and it is desired to ring the bells on the connected with party line, 2 rings, pause and 2 rings which is the eodeof the called party. As soon as the wipers 63 and 64 reach the first contact a circuit is completed from ground through wiper 64, wiper 63, contact #1, lead 65, relay 66 and resistance 67 to battery. Relay 66 locks energized over conductor 68 to ground at switch H, and closes the s rings 69 in the circuit of ringer relay 70. elay 70 energizes to connect generator current to the called line and to the various `bells thereon as follows: Springs 71 and 72',

springs 73 and 74 s rings 75, wiper 13, to and through the beils .of the called part line, and back through wiper 11, springs 75 and 77, and upper winding of rin cut off relay 78 to battery. Relay 78 is t e usual type of ring cut off relay and does not energize with ringing current. The ground which energizes relay 70 it will be seen is the same that operates the magnet 54 of the switch C, and therefore relay 70 energizesl once for each step of the wipers 63 and 64.

The first time relay 7 0 energizes therefore is by the same ground impulse which steps the wiper 63 to its second contact. As the second contact has no connection with wipers 40 and 4l relay 66 remains locked up and another ground impulse operates the wiper 63 to its third contact and also energizes relay 70 to ring a second time. As the wiper 63 reaches the third contact, a circuit is closed from ground through said Wiper, contact #3, conductor 79, Wiper 40, and relay 86 to battery. Relay 80 operates to open the1 springs 81 in the circuit of relay 70 so that the next impulse to magnet 54 does not operate said relay and therefore leayes a pause in the ringing of the bells. As wiper 63 in response to this impulse moves to contact :#:4 the circuit of Arelay 80 is again opened and springs 81 close to allow relay 70 to ,be energized twice again in succession as wiper 63 moves first to contact #5 and then to contact #6. As wiper 63 reaches contact #6 a circuit is completed from ground through said wiper, contact #6, conductor 82, wiper 41, and resistance 67 to battery, thus shorting out the relay 66 which has been locked l release if the called man does not answer,

As soon as the called subscriber answers a circuit is completed for the upper windin ofthe ring cut olf relay 78 through the close circuit of the called line, and said relay energizes and locks energized through its lower winding to ground at springs of release rela 5. Relay 78 also opens t e sprin Whie disconneetthe ringing circuitv from t e called line, opens the springs 55 and 56 in the holding circuit of relays 51 and 66 of the switch B, and cuts the called line through .tro the callin line at the front contacts of springs 76 ang 74. Relay 51 of the switch B, which has been held energized from the round through" springs and 56, now fal s back as soon as switch C reaches one of its normal positions and opens the starting circuit of the interrupter and also the springs 58 in Y the impulslng circuit from interrupter l so that magnet 54 of the code switch C now stops. Conversation may now proceed between the'calling-and called subscribers over the heavy conductors sh'own through the switch H. The back bridge relay 83 of the switch H having energized as soon as the relay 7 8 cuts the line through, reverses the connections of the line relay 2 with regard to the talking circuit to reverse battery for meter`v ing or supervisory purposes.

When conversation is completed and the calling subscriber hangs up his receiver `to release the connection, the line relay 2 of switch H falls back and relay 83 also falls back when the called subscriber hangs up. Relays 2 and 83 jointly close circuits for the release relays 81of switch H and 84 of the code switch B, thereby releasing said switches to normal.

With regard tothe codeswitch C 1) ave it is to ybe understood that although I shown only two sets of the banks in the code selector B wired to certain codes in the bank ofthe switch C yet there may be a large number of codes'taken from this same switch C by means of the other contacts being wired, t'o similar adjacent contacts in the various levels of switch B. For instance, the #11 set of bank contacts or the first set of contacts of the first level of switch B, is connected to contacts #2 and 4 of switch C and rings one-pause-one. Other contacts maybe wired in a similar manner to represent other codes such as 1 4, 2 5, etc., the number of codes being equal to the largest number of i stations on a part line. i y The switch D Figure 2) is a switch that 1s set apart for ring back calls only and is accessible through some level of the selectr switches of the system which is set apart for calls from one station on a part line to anether station on the same line. hen a calling subscriber seizes a selector switch and operates it to its special level b means'of his callin device, connection wil therefore be exten ed to an idle one of a group of switches such as D.

As soon as a selector seizes a switch such as 1), a circuit is completed for the line relay 100 thereof, which relay energizesto close the circuit of relay 101 at springs 102 I and 103. Relay 101'e-nergizes to connect ground through springs 105 and 106, and throughsprings 107 and108 to the holding trunk 109 ef the selector, repares a circuit at springs 110 and 111 or relay 112 and magnet 113 and opens a pointv at springs 108 and 114 in another circuit. As soon as the calling subscriber operates his calling device for 'the code selecting or last two digits of the called number, relay operv .ates in response thereto to control relay i112 and magnet 113. Relay 112 remains energized during the impulses of the first digit to hold a new energizing circuit for itself and magnet 113 closed after the fofr normal springs are operated by the first vertical,

step of the switch, and magnet 113'operates to step the wipers 115 and 116 to the desired level of its bank. Y,As soon as relay v112 falls back after the first digita circuit is prepared for the slow 'relay 117 androtary magnet 118 through springs 119 and 120. When relay 100 operates for the impulses of the next digit, therefore, relay 117 and magnet 118 are o erated. Magnet 118 operi ates toI step the wipers 115 and 116 to the desired contacts to which the. code of the wanted subscriber is connected, and relay 117 energizes .to close a circuit through.l springs 121 and relay 122 to battery. Relay 122 energizes and is locked energized through springs 123 and off normal springs 124 to ground. Relay 117 also holds, springs 125 open in the circuit of relay 126. It will be understood that the code interrupter switcht C is exactly like the switch C (Fig. 1) and is wired in the same manner to the banks of the switch D," and I have shown the same codes wired up in this switch C as in the switch C. v

After relay 117 falls back the springs 125 are closed to prepare the circuit of relay 126 which is now held open at springs 102 and 104 of the line relay 100. lin this type of a ringback call the calling subscriber hangs up his receiver as soon as he has operated switch D. Relay 100 falls back and completes the circuit of relay 126 through springs 102 and 104, springs 110 and 111 and springsy 125.

Relay 126 `energizes to close springs 127 which completes a nc-w energizing or locking circuit for release relay 101 through springs 135 of relay 136, springs 108 and 107, and springs 106 and 105 to ground, preventing `the release of the selector switch. Rela 126 also disconnects the line relay 100 rom the calling line at springs 129 and 130 and springs 131 and132, and completes a ringing circuit for the bells of the calling station through thesprings 137 of relay .136 and to spring 138 of relay 139 which spring is later to be switched from ground to ringing current. The closure of springs 128 by relay7 126 closes an energizing circuit for the relay 140. Relay 140 upon energizing closes a ground circuit to start the interrupter relays I and also com letes the circuit from conductor 62 throug springs 141 to the rotary magnet 54 of the switch C tostart the step by step operation of the switch C" over its bank.

As the wiper 63 of switch C reaches its first contact, a circuit is completed fromv ground through said wipers, conductor 142, relay 143 and resistance 144 to battery. Relay 143 energizes to close thesprings 145 in the circuit of ringing relay 139. Now as the next ground impulse comes over conductor 62 to step the wipers 63 and 64wto their second contact, the ground also passes through springs 1.46 and springs 145 to' relay 139. Relay 139 energizes momentarily to connect generator current through spring 138 and its front contact to the calling line and back over the other side of the line through springs 131 and 133 and through the lower winding of ring cut oil' relay 136 to battery. The next impulse'of ,ground moves wipers 63 and 64 to the third contact and operates relay 139 to ring once more. :When the wiper 63 reaches contact #3 however, ,a circuit is completed for the relay 147 over wiper 115 and its contact and relay 147 opens springs 146 to prevent the next ground 'mpu1se, which moves wipers 63 and 64 `o their fourth contacts, from operating relay 139, thus causing a pause in the ringing. Relay 147 falls back as soon as wiper 63 leaves the third contact andthe ring proceeds for two more steps until the Wiper 63 reaches the :#:6 contactat which time a circuit is closed from ground through wiper 63', contact #6, wiper 116, r'and resistance 144 to battery, thus short ciitiuiting the relay 143and causing it tofall back and open the springs 145 in the circuit of relay 139. Relay 143 will remain back until the switch C reaches its 13th contact, at which time the ringing will again proceed in thesame manner.

AAs soon as the called subscriber removes his receiver in response to the ringing of his bell in accordance with his particular code, a circuit is completed for the ring cut o' relay 136 in series with the called line circuit and relay 136 therefore energizes to. cut-oil the ringing circuitat springs 137, locks itself to ground through its u per winding, removes ground from the re ease trunk b y opening springs 105 and 106, o ens the springs 135 in the holding circuit o relay 101 and closes a circuit at springs 105 and 148 for the release ma et 149 throu h the orf normal springs. lay 126 is he d energized until the switch D releases and therefore prevents the line' relay 100 from again energizing, and as ground is removed from the release trunk, the selector and* subscribers individual line switch will therefore release also. However, since the called man now has his receiver oif the line switch will immediately re-operate and extend the lline to the same or another selector, after which the line relay of the selector will feed bat tery current for talking "to the calling line y and the calling and called nien may converse over the local circuit of their own line,"the

calling man/ having a ain removed his receiver when he` notice the stoppin of the bells of his own station occasione by the response of the called man. I'twill be-seeriv that the code selector D may have access toVv .as many codes as desired in the same manner as the switch C (Fig. 1) and that the switch D is released immediately after signalling the called man and is then accessible for use by another subscriber. t will be seen therefore, that I have provided a very eicient and simple method of extending calls from one multiparty line toanotlier and also for signalling another party on the same multil party line, all by means of codes and that my system is very adaptable especially to rural community systems where it is often desirable ,to have as many as 12 or 15 sta'- tions on a si le arty line. i ,i g

Having ful y escribed and ascertained the features yand aspects of my invention, what I considerrto benew and desire to have protected by Letters Patent will be pointed out in the appended claims.

What I claim as my invention isz.

1. In a telephone system, lines, a plurality of stations on each line, an automatic switch' for extending connection to any of said lines, a signal for each station on a line, means for operating the signals on a line; consisting of an auxiliary code selecting switch associated with said automatic switch, and a code interrupter having a series of contacts and a wiper co-operating therewith, the contacts of said code interrupter connected in pairs to various contacts accessible to-said code selector, vand means for operating the code llt) erated in accordance with a code of la certain.`

subscriber.

2. In a telephone system, lines, a plurality of stations on each line, automatic progressively movable switches for establishing a connection between a pair of said lines, a signal for each station on the called line, a rotary switch having a wiper adapted to move over a series of contacts to connect ground thereto, and a code selector associated with one of saidprogiessively movable switches having means for connecting a ringing relay to various contacts of said rotary switch, a ringing relay operated by the connection of ground to the various contacts to which it is connected to operate the signals of the stations on the called line in accordance with a predetermined code.

3. In a telephone system, a line, a plurality of stations on said line, a ring back switch accessible to said line having wipers, a code interrupter switch accessible to said ring back switch, said code interrupter consisting of a series of contacts and a wiper for connecting one side of a battery successively to said contacts, a code selector perated in response to a digit of the called number to establish connections from its wiper to any of the contacts 'of said code interrupter, and a ringing relay for the ring back switch'operated in accordance with the code of the called line to ring the bells of the stations on the called line, as the wiper of the code interrupter connects with the selected contacts.

4. In a telephone system, a line, a plurality of stations on said line, a .ring back switch accessible to said line having wipers, a code interrupter switch accessible to said ring back switch, said code interrupter consisting of a series of contacts and a wiper for connecting one side ofy a battery successively to said contacts, a code selector operated in response to a digit of the called number to establish connections from its wipers to any of the contacts of said code interrupter, a ringing relay for the ring back switch operated in accordance with the code of the called line to ring the bells of the stations on the called line, as the kwiper of. the code inteirupter connects with the selected contacts, and means controlled by the response of the called subscriber for releasing said code selector switch.

5. In a telephone system, a ring back switch having a ringing relay for connecting a generator to a party line to ring the bells o movable rotary switch having a wiper and a series of contacts successively connected with thereby, wipers and a bank of contacts for the ring back switch,J said wiper the stations thereon, a progressively controlled b a calling subscriber tonestabtacts in the bank of said rotary switch, and means in the ring back switch controlled by the successive connectionI of the wiper of the rotary switch with its contacts for intermittently closing the circuit of said ringing relay to operate the bells of the stations 'on a called line in accordance with the predetermined code of a certain station thereon.

6. In a telephone system, a ring back switch having a ringing relay for connecting a generator to a party line to ring the bells o the stationsthereon, a progressively movable rotary switch having a wiper and a series of contacts successively connected with thereby, wipers and a bank of contacts for the ring back switch, said last men- 'lish connection with a plurality ofthe contioned wipers controlled by a. calling subscriber to establish connection* with a rality of the contacts in the bank -of rotary switch, and means in the ring back switc controlled by the successive connection of the wiper of the rotary switch with its contacts, for intermittently closing the` circuit of said ringing relay to o erate the/ bells of the stations on a called ine'in accordance with the predetermined. code of a certain station thereon, and means, controlled by the response of the subscriber at the called station for releasing said ring plusaid ,back switch.

7. In a telephone system, party lines, connector switches and rin back switches accessible to one of said lines for signaling a party on another party line and a party on thesame line, respectively, a code selector for the connector, a eodeiselector for the rin back switch, "and code interrupters accessible to said code selectors, each of said code selectors having means responsive' to a plurality of digits of .a called number for picking out a particular set of contacts in the bank of the code interrupter, said code interrupter consisting of Ja rotatable wiper operated fronithe code selector to successively ground the contacts in its bank to signal the called subscriber.

8. In a telephone system, a line, a plurality of stations on said line, an automatic switch accessible thereto having a rin ing -relay for connecting a generator to said ine to operate the signals at said stations, an interrupter, an 'auxiliary rotary switch for said automatic switch for controlling said ringing rela said rotary switch adapted to connect sai ,interrupter in series with saidringer relay and battery at one stage of the movement of the switch to allow said relay to be intermittently energized to connect said generator to the line, and adapted at another stage in its movement to temporarily disconnect the interrupter from the relay, and at another stage to permanently disconnect the interrupter from the relay whereby the bells of said stations may be operated in accordance with a predetermined code.

9. lIn a telephone system, a linefa plurality of :stations on `said line, means controlled from one of the stations on said line for operating the call signals at all the other stations on said line in accordance with a predetermined code, consisting oiga a1r' of control relays, a progressively mova le interrupter switch, a pair of wipers o erable to connect said control relays to different sets of the contacts of sai,d,interrup.terto variably control a circuit, and a' ringing relay in the circuit controlled by said relays to first ring sthe bells a number of times and then a further number of times after a pause, the code depending upon whichcontiicts .of the interrupter the control relays are connected to. i

10. In a signaling system, a line, a signal on said line, a source of signalin current, a relay for controlling the application of said source to said line to operate said signal, a circuit for said ringing relay, and a pair of control relays for controlling the circuit of said ringing relay to cause the latter to applyT signaling current to the line to, o erate said signal in accordance with :il particular code.

11. In a signaling system, a line, a signal on said line, a source of signaling current, a relay4 for controlling the application of said source to said line to operate said signal, a circuit for said ringing relay, a pair of control relays for controlling the circuit of said rin 'ng relay to cause the latter to apply signa in current `to the line to operate said signa in accordance with a particular code, circuits for'said control relays, and a rogressively movable switch having a set oi) contacts and a wiper movable thereover for controlling the action of the control relays.

12. In a signaling system, a line, a signal on said line, a source of signaling current,

a ringing relay for controlling the application of said source to said Vline to operate said signal, a circuit for said ringing relay, a pair of control relays for controlling the circuit of said' ringing relay to cause the latter ,to apply signaling current to the line to operate said signal in accordance with a articular code, circuits for said control reays, a progressively movable switch having a set of contacts and a wiper movable thereover for controlling the action of the control relays, and an interrupter in the ringing relay circuit for controlling the action of the ringing relay. i

13. In a signaling system, a line, a signal on said line, a source of signaling current, a

ringin relay for controlling the application of sai source to said line to operate said signal, `a circuit for said ringing relay, a

pair of control relays for controlling the circuit vof said ringing relay to cause the latter to apply signaling current to the line to operate said signal in accordance with a particular code, and an interru ter inthe Iringin relay circuit lfor control ing the ac-v tion o the ringing relay.

14. In a signaling system, a line, a signal on said line, a source of signaling current, a ringin relay for controlling the application of'sai -source to said line to operate said signal, a circuit for said ringing relay, a pair of control relays for controlling the circuit of said ringing relay to cause the latter to apply signaling current to the line to operate said si al in accordance with a articular code, circuits for said control reays, a progressively movable switch having a set of contacts and a wiper movable thereover for controlling the action ofthe control relays, an interruptor in the ringingrelay circuit for controlling the action of the ringing relay, and an interrupter for controllingI the step by step action of said rotarv switch.

15, In a signaling system, a line, a signal on said line, a source of signaling current, a ringing relay for controlling the application of said source to said line to operate said signal, a circuit for said ringing relay, a pair of control relays for controlling the circuit of said ringing relay to cause the latter to apply signaling current to the line to operate said signal in accordance with a articular code, circuits for said control reays, a progressively movable switch having a set of contacts and a wiper movable thereover for controlling the action of the control relays, and an interruptor in the ringing relay circuit for controlling the action ofthe ringing relay, one of said control relays completing the circuit of the ringing relay to render the ringing relay subject to the interrupter.

16. In a signaling system, n line, a signal on said line, a source of signaling current, a ringing relay for controlling the application of said source to said line to operatesaid signal, afcircuit for said ringing relay, a pair of control relays for controlling the circuit of said ringing relay to cause the latter to apply signaling current to the line to operate said signal in accordance with a particular code, and an interrupter in the ringing relay circuit for controlling the action of the ringing relay, one of said control relays completin the circuit of the ringing relay to render t e ringing relay subject to the interrupter.

17. In a signaling system, a line, a signal onsaid line, "a source of signaling current, a ringin relay for controlling the application of sai source to said line to operate said signal, a circuit for said ringing relay, a pair of .control relays for controlling the ico circuit of said ringing relay to cause the latter to apply signaling current to the line to operate said signal yin accordance with a articular code, circuits 'for said control reays, a progressively movable switch having a set of contacts and a wiper movable there- -tion of said source to said line to operate said signal, a circuit for said ringi relay,

-a pair of control relays for controlling' the circuit of said riiging relay to cause the latter torapply signaling current to the line to operate said ,signal in accordance with a articular code, circuits for said control reays, a progressively movable switch having a set of contacts and a wiper movable thereover' for controlling the action oftheJ control relays, and an interrupter in the ringing relay circuit for control ing the action of the ringing relay, one of said control relays Vcompleting the circuit of the ringing relay to render the ringing relay subject tothe interrupter, the other of said control relays operating to render the ringing relay nonresponsive to the interrupter.

19. In a signaling system, a line, a slgnal i on said line, a source of signaling current,

a ringing relay for controlling the `application olf said source to said line' to operate said signal, a circuit for said ringing relay,

a pair of control relays for controlling the circuit of said ringing relay to cause the latter to apply signaling current to the line to operate said signal in accordance with a particular code, and an interrupter in the ringing relay circuit for controlli the ac-. tion of the ringing relay, one of sai control relays completing the circuit of the ringing relay to render the ringing relay subjectto the interrupter, the other of said control relays operating to render the ringing relay non-responsive to the interruptor. y

20. ln a signaling system, a line, a signal on said line, a source of signaling current, a ringing relay for controlling the application of saidl sourceiosaid line to operate said signal, a circuit for said ringing relay, ,a pair of control relays for controlling the circuit of said ringing relay to cause the latter to apply ringing cuilrent to the line to operate said signal in accordance with a particular code, circuits for said control relays, a progressively movable switch having a set of contacts and a wiper movable thereover for vcontrolling the action of the control relays, an interrupter in the ringing relay circuit for controlling the action ofthe rin ng relay, and an interrupter for `contro ing the step by step action of said rotary switch, one of said control relays completing thecircuit of the ringing relay to render the ringing relay subject to the interrupter, the other of said control relays operating to render the ringing relay non-responsive to the interrupter. 21. In a signaling system, a line, a signal on line, a source of signaling currenty a rlnging relay for controlling the application of said source to said -lineoto operate said signal, a circuit for said ringing relay, a pair of control relays for controlling the circuit of said ringing relay to`cause the latter to apply signaling current to the line to operate said signal in accordance with a pari ticular code, circuits for said control relays, a progressively movable switch having a set oit contacts and a wiper^movable thereover for controlling the action of the control relays, and an automatic progressively movable switch having wipersforvariably con.

the rotary switcli `nectiing said control relays to the contacts of v 22.1In a telephone system, an automatic switch, a ringing relay for the switch, a pair of control vrelays for controlling the circuit of the ringing relay to apply generator to the called line to signal the subscribers thereon, a rotary interrupter switch having a wiper and a series of contacts successively grounded thereby, means for connecting said control relays to a predetermined set of contacts in said rotary switch, one of said relays energized and locked energized by the first movement of the switch to .start the intermittent operation of the ringing relay, the other relay energized when the wiper of the rotary switch meets the contact to which it is connected; to temporarily render the ringing relayinoperative, and said first relay unlocked when the wiper meets'anotlier contact to which this relay is connected to stop the operation ofY the ringing relay, whereby the call signals of the called line may be operated in accordance with a code.

23. lin a telephone system, a line, an automatic connector switch for connecting with said linea ringing relayfor applying ringing current to said line, a code selector` a code interruptor, bank contacts in said code interruptor connected to bank contacts in said code selector, means if'or operating said code selector to pick a particular set of contacts in said code interruptor. and means for applying ground to the selected bank contactsin said code interrupter to variably operate said ringing relay in 'applying ringing current/to said line.

24. ln a telephone system, a party line having a plurality lci substatiqns thereon,

- therefor, a. ringin relay for applying ringing current to sai line,'mean`s for operating said ringing relay and said operatmgmagnet in synchronism, and means contro said, code interrupter for intermittently stopping theLoperation of'said ringing relay to apply a code ring to said ringing relay:

25. In a tele hone system, a .party line having a plura ity of substations thereon,

an automatic switch adapted to connect with scriber on one of said `lines may 4establish a connection with Lanother of said lines by means of said first automatic switch, a code interrupter having coiitactvs connected 1 n pairs accessible to said' other automatic switch, a ringing relay 1n said" first auto matic switch, and means for applying ground to apair of bank contactsin said code interrupter to variably energize said ringing relay to selectively signal the partiesL on the connected `line.

27. In'a telephone system, an automatic switch, a ringing relay-thereforaa ringing.

interrupter having,1r "bank contacts accessible thereto, means` for operating `sa1d relay and said interrupter in synchronism. means for picking out a certain set of said bank contacts in said interrupter, and means for preventing the operatic@j of said relay while the interrupter engages said certain contacts to cause said relay to ring a predetermined code,

l 28. In a party line telephone system, ainal connector controllable in aaccordance with digits in a called number for completing connection to a party line, an auxiliary code selector responsive to other digits in the number, and automatic code generatingpmeans for signalling the called line according to a 'definite code, the said code comprising a plurality of groups of signals, and the number of groups and the number of signals in a group corresponding to the number and denomination of the digits iin accordance with which the said code selector is operated. 29. In a code ringing qmechanism, a two movement code selector switch, means for transmitting two successive series of ,impulses to said switchto operate it, andcode generating mechanism automatically responsive thereafter to (produce a code made up of two groups of signals, the number of signals in said groups corresponding, re-

ed by spectively, to the number of impulses in said series.

30. In a code ringing machine, a col/de selec-` tor switchI having step by step primary and step by step seconda o movements, means for operating said switch to select a code,

and code generating mechanism for producing automatically two oups of signals corresponding, respective y, to the number of st'eps taken by the said code selector in its two movements?v `31. In a party line telephone system, an automatic connector switch for completing 'aiL connections to called lines, and code ringing mechanism associated with said connector comprising two step by step switches having their banks permanently wired together.

32. In a party line telephone system, an

automatic connector switch fori completing'- connections to called lines, a code selector associated with said connector forselecting code signals corresponding to desired stations on connected called lines, and a code interrupter switch having its bank permanently wired to the bank of said selector'v switch. ,y J 33. In a party line telephone system, an automatic connector switc for completing connections to called lines, a ringing relay individual to said connector, and two automatic step by step switches co-operating for controlling said relay in accordance with predetermined codes, one of said switches being subscriber controlled in order to select the'particular codes desired. i

34. In a. code ringingv machine, a code selector switch having a pair of wipers and associatedy banks of contacts, code stop and spacing relays connected to'said wipers, respectively, a code interrupter switchl having an automatically driven wiper and associated bank, and connections from the bank of said interrupter switch -to both banks of said code selector switch for controlling said relays.

35. In a cede ringing machine, a subscriber controlled code selector switch, an automatically operated interrupter switch, permanent connections between the banks of said switches. and ringing mechanism in said selector switch controlled by said interrupter switch over the said bank connections.

36. In a code ringing machine. a subscriber controlled code selector switch, an automatically operated interrupter switch. permanent `connections between the banks of said switches, ringing mechanism iii-said selector switch, and ringing control relays in said selector controlled by said interrupter switch over said bank connections.

37'. In a. code ringing machine, a subscriber controlled code selector switch, an automatically operated interrupter switch, permanent connections between the banks of asl aaeneee said switches, a ringing relay, a starting relay initially energized by said inte'rrupter switch for closing a circuit for said ringing relay, a spacing relay for breaking the circuit ot said ringing relay, and a circuit for said spacing relay including one of said bank connections.

38. ln a code ringing machine, a subscriber controlled code selector switch, an automatically operated interrupter switch, permanent connections between the banks of said switches, a ringing relay, a starting relay initially energized by said interrupter switch for closing a circuit for Vsaid ringing relay, a spacing relay for breaking the circuit of said ringing relay` a circuit. for said spacing relay including one of said bank connections, and a circuit established over another one of said bank connections for short circniting said starting relay to deenergize the same.

39. ln a codev ringing machine, asubscriber controlledV code selector switch, an automatically operated interrupter switch, permanent connections between the banks of said switches, a ringing relay, and a circuit therefor, two relays in said selector switch, one for closing said circuit and the other for opening it, and circuits for said selector relays closed by saidinterrupter switch over said bank connections. v

4:0. lln a code ringing machine, a ringing relay, a starting relay for closing a control circuit for said ringing relay, means for energizin said starting relay to start the transmission of a code signal, a spacing relay and an interruptor co-operating to control said circuit to produce the code signal, and means for short circuiting saidstartinnf relay to deenergize the same at the end oli the code signal.

Lil. In a code ringing machine, a subscriber controlled code selectinvr switch, an automatic code interrupter swltch, a ringing relay in said selector switch, a motor magnet for said interrupter switch, and cirmagnet for said interrupter switch, a circuit having two branches, one branch including said relay and the other branch including said magnet, and a device for intermittently closing said circuit.

43. ln a code rin ing machine, a directively controlled co e selecting switch, an automatic code interrupter switch, a ringing relay in said selecting switch and a motor magnet for said interrupter switch, a circuit havin two branches, one branch including said relay and the other branch including said magnet, a device for intermittently closing said circuit, and relays in the selector switch controlled by the interrupter switch for opening and closing the said relay branch independent of the said motor magnet branch.

44. In a code ringing machine, a direcvtively controlled code selecting switch, an automatic code interrupter switch, a, ringing relay in said selecting switch and a motor magnet for said interrupter switch, a circuit having two branches, one branch including said relay and the other branch including said magnet, a device for intermittently closing said circuit, a code start and stop relay and a code spacing rela for controlling the said relay branch, an circuits controlled by the wiper ot' said interrupter switch for energizing and deenergizing said code relays.

4:5. In a party telephone system, a connector switch for connecting with a called party line, an auxiliary code selector switch having bank contacts arranged in levels, means for o erating said code selector in accordance with the code desired to advance its wipers to a particular level and to a particular set of contactsin the selected level, a ringing relay, and means for automati- -cally operating said relay a plurality of times corresponding to the number of the selected level and then a luralit of times corresponding to the num er of t e selected contact set in such level.

Signed by me at Chicago, Cook County, illinois, this 24th day of June, 1919.

arenaria i.. NELSON. 

